(1) Name the ionic compound represented by the following chemical formula: CuO. (1 point)
copper (II) oxide
copper dioxide
copper oxide
copper (II) oxygen
(2)Which of the following comes first in the name of an ionic compound?(1 point)
the number of ions present
the negatively charged ion
the neutral ion
the positively charged ion
(3)Write the chemical formula of the ionic compound magnesium chlorate. The magnesium (Mg) ion has a +2 charge. Chlorate (ClO3) has a −1 charge.(1 point)
Mg (ClO3)2
Mg (ClO 3 )
Mg2 (ClO3)
Mg 2 (ClO 3 )
(4)Which option is a negatively charged ion?(1 point)
chlorine
chlorite
chlorate
chloride
(5)When moving across a period from left to right in the periodic table, excluding transition elements, which trend occurs?(1 point)
Valence electrons decrease by one.
The energy levels decrease by one.
Valence electrons increase by one.
The energy levels increase by one.
(1) copper oxide
(2) the positively charged ion
(3) Mg(ClO3)2
(4) chloride
(5) Valence electrons increase by one.
(1) The ionic compound represented by the chemical formula CuO is copper (II) oxide.
(2) In the name of an ionic compound, the positively charged ion comes first.
(3) The chemical formula of magnesium chlorate is Mg(ClO3)2.
(4) The negatively charged ion is chloride.
(5) When moving across a period from left to right in the periodic table, the number of valence electrons increases by one.
(1) To name the ionic compound represented by the chemical formula CuO, we need to determine the charges on each ion and use them to balance the charges. In this case, Copper (Cu) typically has a +2 charge, and Oxygen (O) typically has a -2 charge. To balance the charges, we need one Copper ion and one Oxygen ion. Therefore, the ionic compound is named copper (II) oxide.
(2) When naming an ionic compound, the name usually begins with the positively charged ion. This is because the positive ion is usually a metal and is named first, followed by the negatively charged ion, which is typically a nonmetal. This order is used to maintain consistency in naming compounds.
(3) To write the chemical formula of the ionic compound magnesium chlorate, we need to determine the charges on each ion and balance them. In this case, magnesium (Mg) has a +2 charge, and chlorate (ClO3) has a -1 charge. To balance the charges, we need two chloride ions for every one magnesium ion. Therefore, the correct chemical formula is Mg(ClO3)2.
(4) The negatively charged ion among the options is chloride (Cl-). It has gained an electron, resulting in a negative charge. The other options, such as chlorine, chlorite, and chlorate, are either neutral or carry different charges.
(5) When moving across a period from left to right in the periodic table, excluding transition elements, two trends occur. First, the number of valence electrons generally increases by one. This is because elements in the same period have the same number of energy levels, but as we move to the right, we encounter elements with more protons and electrons, resulting in an additional valence electron. Second, the energy levels do not change within a period, as they represent different rows on the periodic table. Energy levels change as we move down a group or a column.